Furnace for heating drill steels



June 16, 1931. B. R. SHEETS FURNACE FOR HEATING DRILL STEELS File d Dec.1928 5 Sheets-Sheet l June 16, 1931.

B. R. SHEETS FURNACE FOR HEATING DRILL STEELS Filed Dec. 1928 5Sheets-Sheet 2 r ll June 1931- B. R. SHEETS FURNACE FOR HEATING DRILLSTEELS Filed Dec. 1928 5 Sheets-Sheet 3 6110: we L4 June 16, 1931. B. R.SHEETS FURNACE FOR HEAT-ING DRILL STEELS Filed Dec. 31, 1928 5$heets*Sheet 4 amt June 16, 1931. B. R. SHEETS FURNACE FOR HEATING DRILLSTEELS Filed Dec. 51, 1.928

5 Sheets-Sheet 5 Patented June 16, 1931 STATES "PATENT orr es BARTON n.smears, or nENvER, ooLoR'Ano. ASSIGNOR To GARDNER-DENVER COMPANY,

or nnrivnn, oonoaeno, A oonroaerron'or 'DELAVTARE summons-on HEATINGDRILL STEELS Application'filedDecember 31, 1928.' Serial No. 329,589.

The present invention relates morepan' ticularly to forges or furnacesfor heating drill steels and other implements and articles. One'of theobjects is to provide a compact structure in which the various parts areaccessible and readily changeable.

'Another' and important object is to provide means whereby, the workmanis protected from the heat and sparks or products of combustion. Stillanother and important object is to provide a structure which isrelatively noiseless in operation. a

The preferred embodiment of the invention is illustrated; in theaccompanying drawings, wherein:

Figure 1 is a front elevation of the furnace structure.

Figure 2 is an end elevationof the same. Figure 3 is a-vertical crosssectional view taken on the line3-3 of Figure 1 and on a smaller scaleto illustrate the supporting pedestal.

Figure 4 is a plan View of the furnace body with the upper structureremoved.

Figure 5 is a top plan view of the front Wall plate of the furnace body.

Figure 6 is aside elevation of the same. Figure 7 is a plan View of thebottom plate.

sists of a metal box comprising a bottom plate l5provided with suitabledepending reinforcing flanges 16, and bolted as shown.

at 17 to the pedestal. A frontplate 18 and a rear'plate 19 are bolted,as shown at 20 to the, margins of the bottom plate. End

Figure 8 is a side elevation of the same,

plates 21 are likewise bolted to the ends .of the bottom plate 15 andare bolted, as shown at 22, to the front and rear wall plates 18 and 19.Within this metal box or casing is located a lining, preferablyconsisting of ordinary standard fire brick 23, forming a combustionchamber 24;. The top bricks 25 of the lining extend overthis chamber andare suitably formed to produce an outlet throat 26 opening through thetop of the furnace body. The top face of said body constitutes in effecta platform 27 Resting upon this platform 27 is a heating chamber member.This member consists of two metal end walls 28 that looselyrest on theplatform and have interposed. between them a row of fire brick 29,elevated to provide the heating chamber 30. The end walls 28 areconnected by three tie bolts 31 and 32, all of said tie bolts beinglocated above the firebrickand the tie bolts 31 being located'at a lowerplane than the tie bolt 32. These tie bolts serve to secure the partstogether with suflicient pressure to hold the bricks 29 in place, asclearly shown in Figures 3 and 10. The end walls 28 have on' their innersides inwardly extending flanges 33 which serve as guides or positioningdevices for the end bricks 29. The chamber 30 is thus left open both atits front and rear sides and is located over and in communication withthe outletthroat 26 of the combustion chamber 24. 1

Secured to the end plates .21 of the furnace bo'dycasing are standards34 that are located beyond the ends of the i heating chamber member.flhesesta'ndards terminate at their upper ends in'yokes 35. Lo cated insaid yokes are the ends of a pipe 36 that extends through the upper endof a shield 37. This shield is in'the form of a,

flat. sided rectangular thin box, intothe lowercorners of which arefitted nipples 88.

To one of said nipples is connected a fluid supply pipe .39 having acontrolling valve 40 therein; ,Therother nipple is:closed by a cap 41.It will be evident that-the supply pipe canbe" connected to eithernipple as convenience {may dictate. The upper pipe 36 is provided withinthe upper portion of the shield 37 with a plurality of lateral inletopenings 42 (see Fig. l) and one end of said pipe is open as indicatedat 43 so that a discharge pipe leading to any suitable point, may beconnected thereto.

The front wall of the combustion chamber 24 is provided with the usualburner opening 44, and a burner 45 of any suitable construction islocated at the front end thereof. This burner in the present structureis an oil burner, and is supplied by a pipe 46 leading from any suitablereservoir, and controlled by a valve 47. Air is also supplied to theburner, and this air is preheated. For this purpose a relatively largepipe or preheater tube 48 is mounted in the standards 34 above theheating chamber member and behind the upper portion of the shield 37. Inother words, this preheater tube 48 is interposed between these twoparts. Connected to one end of the tube 48 is a pipe 49, by which airunder pressure from any suitable source is supplied to the tube. Thepipe 49 is shown as leading from a T-coupling 50, to one end of which asuitable air conduit can be connected. Air through the pipe 49 iscontrolled by a suitable valve 51, preferably located at the juncture ofsaid pipe 49 with the tube 48 (see Fig. 1). From the opposite end of thetube 48 to that-having the valve 51, a downwardly and forwardly inclinedtube 52, preferably of substantially the same diameter as the tube 48,leads to a position in front of the furnace body and here it is reducedor connected by a small pipe 53 with the burner 45.

Extending from the T-coupling 50 is a branch pipe 54 having a portion 55lying in a groove 56 formed in the front top corner of the furnace body.This pipe is provided with a plurality of upwardly faced outlet ports 57and these serve to produce an upward current of air across the spacebetween the lower end of the shield 37 and the deck or platform of thefurnace body.

The front and rear side walls 18 and 19 of the furnace body casing areprovided with outstanding cars 58 and the lower portions of thestandards 34 have ears 59 alined therewith. Through these ears slidablypass the side rods or bars 60 of a tool supporting frame. The side barsare connected at their front ends by a cross handle bar 61 and behindthe handle bar is an upset horizontally disposed supporting or carrierbar-62 that is thus arranged in front of the furnace body andsubstantially at the height of the platform or deck 27.

With this construction, it will b evident that the heated products ofcombustion generated by the burner will rise through the throat 26 andenter the heating chamber 30. Consequently drill steels or other toolsor articles placed on the deck 27 and sup ported by the bar 62 withtheir inner ends in the chamber 30 will be heated. The shield 37 servesto prevent the radiation of heat in front of the forge and also directsthe heat escaping from the front side of the chamber 30 to the airheater 48. As a further protection to the operator the upwardly movingcurtain of air from the pipe 54 serves not only to carry the heatupwardly but prevents sparks, flame and the like escaping forwardlyunder the shield. This upwardly moving current of air serves to deflectthe heated products of combustion and assists in causing them to passthe preheater. Because of the size of the tube the air passingtherethrough to the burner moves sluggishly so that it is heated beforeit reaches the burner and this slow movement coupled with the structureand arrange ment shown has proven to greatly reduce the noise ofoperation that is the normal accompaniment of a burner of the type. Thesupport obviously is adjustable to suit the length of the articles beingheated and can be moved rearwardly so that it is practically out of theway when not wanted.

From the foregoing it is thought that the construction, operation andmany advantages of the herein described invention will be apparent tothose skilled in the art without further description, and it will beunderstood that various changes in the size, shape, proportion and minordetails of construction may be resorted to without departing from thespirit or sacrificing any of the advantages of the invention.

What I claim, is:

1. In a furnace of the character set forth, the combination with afurnace body having a combustion chamber, and a heating chambersurmounting the same and having an open front side, of a shieldsupported in advance of and above the heating chamber and having itslower end spaced from the body to give access to the open side of theheating chamber, a burner for the combustion chamber, means forsupplying fuel to the burner, and a tubular air heater interposedbetween the upper portion. of the shield and the top of the heatingchamber and located over said top of the latter.

2. In a furnace of the character set forth, the combination with afurnace body having a combustion chamber, and a heating chambersurmounting the same and having an open front side, of a shieldsupported in advance of and above the heating chamber and having itslower end spaced from the body to give access to the open side of theheating chamber, a burner for the combustion chamber, means forsupplying fuel to the burner, a tubular air heater interposed betweenthe upper portion of the shield and the top of the heating chamber andlocated over said top of the latter, and means for creating an upwardflow of airacross the space between the furnace body-and shield,

said shield directing such flow to the air I heater.

3; In a furnace of the character set forth, the combinatlon w1thafurnace body having a combustion chamber, and a heating chambersurmounting-thesame and having an from the furnace body in front of theopen side of the heating chamber, a burner for the combustion chamber,means for supplying fuel to the burner, and means for supplying air tothe said burner, including a tubular air preheater supported by thestand ards above the heating chamber and interposed between the portionsof the heating chamber and shield.

4. In a furnace of the character set forth,

the combination with a furnace body having a combustion chamber, and aheating chamber surmounting the same and having an open front side, ofstandards at the ends of theheating chamber, a forwardly and downwardlyinclined shield hung from-thestandards and spaced from the furnace bodyin front of the open side of theheating chamber, a burner for thecombustion chamber, means for supplying fuel to the burner, means forsupplying air to said burner, including a tubular air preheatersupported by the standards and interposed between the upper portions ofthe heating chamber and shield, and a pipe located on the furnace bodyand delivering upward jets of air across the. space between the body andshield and toward the preheater.

5. In a furnace of the character set forth, the combination with afurnace body having a combustion chamber provided with an outlet throatopening through the top of the body, of a heating chamber membercomprising relatively movable-end walls that removably rest on the topof the furnacebody,means connecting the end walls for moving themtowards each other, and a top wall of fireresisting material clampedbetween the end walls and spaced from the top of thefurnace body abovethe throat leaving open sides.

6. In a furnace of the character set forth, the combination with afurnace body having a combustion chamber provided with an outlet throatopening through thetop of the body, of a heating chamber membercomprising end walls that are adjustable toward each other and removablyrest on the top of the furnace body, a top wall of fire brick interposedbetween the end walls and spaced from the top of the furnace body abovethe throatleaving open sides,;and tie bolts con.-

necting the end walls and thereby clamping the fire brickin placebetween them.

7. In a furnace of the character set forth, the combination with afurnace body having a combustion chamber provided with an outlet throatopening through the top of the, body, of a heating chamber membercomprising end walls that removably rest on the top of the furnace body,a top wall of'fire brick interposed between the end walls and spacedfrom the top of the furnace body above the throat leaving open sides,tie bolts clamping the end walls together and securing the fire brick inplace, standards mounted on'the furnace body at the ends of the heatingchamber, and a shield supported by the standards and extendingdownwardly in advance of said member and in spaced relation to thefurnace body.

8. In a furnaceof the character set forth, the combination with afurnace body having a combustion chamber providedwith an outlet throatopening through the top of the body, of a heating'chamber membercomprising end w'alls that removably rest on the top of the furnacebody, a top wall of fire brick interposed betweenthe end walls andspaced from the top of the furnace body above the throat leaving opensides, tie bolts clamping the end walls together and securing the firebrick in place, standards mounted on the furnace body at'the ends of theheating chamber member, a shield supported by the standards andextending downwardly in advance of said member and in spaced relation tothe furnace body, a burn er for the combustion chamber, and air supplymeans for the burner including a preheater interposed between theheating chamber member and the shield.

9. In a furnace of the character set forth, the combination with afurnacebody having a combustion chamber, and a heating cham-' bersurmounting the body and in communication with the combustion chamber,said heating chamber having an open front side, of ears on the ends ofthe furnace body, supporting bars slidable in the ears and extending inadvance of the furnace body, a handle bar connecting the front ends ofthe supporting bars,"and an article carrier bar connecting thesupporting bars in rear of-the handle bar and supporting the front iends of the articlesentered'in the open front sideof the heating"chamber.

10. In afurnace of the character set forth, the combination withsupporting means, of a furnace'body mounted on the supporting means andhavinga combustion chamber that opens throughth'e top of the body, aheating chamber. member on the top of the body, the heating chamber ofsaid body being in communication with the open top of the combustionchamber and having an open front, standards rising from the body at theends of the open front ofthe combustion chamber, a shield mounted on thestandards and located in front of the combustion chamber member with itslower edge above the body and giving access to the front opening, aburner for the combustion chamber, means for supplying fuel to theburner, and means for supplying air to the burner, including a tubularair preheater extending behind the shield and along the front upperportion of the heating chamber member, means for supplying air to oneend of the preheater at one end of the body, and a pipe leading from theother end of the preheater at the other end of the body and extending tothe burner.

11. In a furnace of the character set forth, the combination withsupporting means, of a furnace body mounted on the supporting means andhaving a combustion chamber that opens through the top of the body, aheating chamber member on the top of the body, the heating chamber ofsaid body being in communication with the open top of the combustionchamber and having an open front, standards rising from the body at theends of the open front of the combustion chamber, a shield mounted onthe standards and located in front of the combustion chamber member withits lower edge above the body and giving access to the front opening, aburner for the combustion chamber, means for supplying fuel to theburner, and means for supplying air to the burner including a tubularair preheater extending behind the shield and along the front upperportion of the heating chamber member, an air supply pipe of lessdiameter than the preheater extending upwardly along one end of the bodyand connected to one end of the preheater a pipe of substantially thesame diameter as the preheater connected to its other end and having adown-turned portion at the other end of the body, and a pipe of lessdiameter than the preheater connecting the last said pipe with theburner.

12. In a furnace of the character set forth, the combination with a bodyhaving a combustion chamber that opens through the top of the body, abrick Work supported over the body and over the open top of thecombustion chamber in spaced relation to both, forming a heating chamberthat is open both at the front and rear, the front end terminating shortof the front end of the body, forming a platform, a shield supportedabove the front portion of the body with its lower edge in spacedrelation thereto and in advance of the brick work, giving access to theopen front of the heating chamber, a burner for the combustion chamber,and an air supply conduit for the burner extending across and above thefront portion of the body and behind the shield along the upper frontportion of the brickwork and having a downturned portion that extends tothe burner.

13. In a furnace of the character set forth, the combination with a bodyhaving a combustion chamber that opens through the top of the body, abrickwork supported over the body and over the open top of thecombustion chamber in spaced relation to both, forming a heating chamberthat is open both at the front and rear, the front end terminating shortof the front end of the body, forming a platform, a shield su portedabove the front portion of the body with its lower edge. in spacedrelation thereto and in advance of the brickwork, giving access to theopen front of the heating chamher, a burner for the combustion chamber,and an air supply conduit for the burner comprising a branched supplypipe, one of the branches being perforated and extending along theplatform at the bottom of and in advance of the front opening of theheating chamber, the other branch extending upwardly at one end of thebody and the brickwork, a substantially straight air preheating tube towhich the upwardly extending branch is connected, said tube extendingalong the front upper portion of the brickwork behind the shield andabove the said front opening, and a downwardly extending air conveyorpipe of substantially the ame diameter as the tube connected to theother end of said tube and having a reduced connection with the burner.

In testimony whereof, I afiiX my signature.

BARTON R. SHEETS.

